Effect of casting mode and thermal treatments on the electrical conductivity of the AA4006 aluminum alloy

Daniel Sierra Yoshikawa,Leandro Gomes De Carvalho,Angelo Fernando Padilha,Ronald Lesley Plaut

doi:10.1590/0370-44672015700072

Daniel Sierra Yoshikawa, Leandro Gomes De Carvalho + Show 2 more

Open Access

https://doi.org/10.1590/0370-44672015700072

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Abstract

Abstract Initially studied was the effect of the casting mode on the electrical conductivity of AA4006 aluminum alloy sheets produced by both Twin Roll Casting (TRC) and by the semi-continuous Direct Chill (DC) industrial processes, when compared to sheets with commercial purity (AA1050) and high purity aluminum (AA1199). Then, the effects of heat treatments on the electrical conductivity of the AA4006 alloy sheets produced by TRC were also studied. Isochronous and isothermal heat treatments allowed to obtain the precipitation and solution kinetics of the intermetallic compounds. The precipitation kinetics was analyzed with the help of the Johnson-Mehl-Avrami-Kolmogorov equation.

Highlights

Electrical conductivity measurements can be used for the evaluation of the concentration of solute atoms in the solid solution of aluminum alloys, since this property decreases with increase of the solute content in these alloys (Oliveira and Padilha, 2009)
Due to its (Fe + Si) content being with increasing Fe and Si contents, higher than that for the commercial produced by the Twin Roll Continuous purity aluminum (AA1050, AA1070, Casting - (TRC) and the semi-contin
The technique used in the evaluation of the electrical conductivity allowed the follow-up of changes in solute concentration in solid solution that occurred due to the casting mode and due to heat treatments

Summary

Introduction

Electrical conductivity measurements can be used for the evaluation of the concentration of solute atoms in the solid solution of aluminum alloys, since this property decreases with increase of the solute content in these alloys (Oliveira and Padilha, 2009). In this way, heat treatments, which alter the solute concentration in solid solution, strongly influence the electrical conductivity. Due to its (Fe + Si) content being with increasing Fe and Si contents, higher than that for the commercial produced by the Twin Roll Continuous purity aluminum (AA1050, AA1070, Casting - (TRC) and the semi-contin-. AA1100), the AA4006 alloy presents uous Direct Chill - (DC) processes. (Yeung and Lee, 1998; Souza et al, face and at the center of the sheets.

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